Radioreceiver



Patented Mar. 27, 1928.`

PATENT OFFICE.

GEORGE F. BORKMAN, F SALT LAKE CITY, UTAH.

RADIORECEIVER.

Application led December 4, 1924. Serial No. 753,844.

M invention relates to receivers vfor radios-and like devices, and has for its'object to provide an economical and eiicient amplifying receiver by which the sounds are transmitted clearer and reproduced without the discordant metallic sound now commonly heard through devices of similar kinds.

These objects I accomplish with the device 0 illustrated in the accompanying drawings in which similar letters and numerals of reference indicate like parts throughout the several views, and as described in the specification forming a part ot' this application -5 and pointed out in the appended claims.

' In the drawings in which I have shown the best and most substantial embodiment of m invention, Figure. 1 is an edge view of the evice, with the horn and enclosing case 50 omitted. Figure 2 is another View of the same at right angles to the positions shown in Figure 1. Figure 3 is a plan view of the device, and Figure 4 is a side and plan view of one of the magnets. Figure 5 is an end 55 view of the armature and an edge view of the diaphragm with the connecting means.

One of the special features of my 'invern' tion is to build up the ermanent magnet by a plurality of flat bars R rigidly fastened to- :0 gether by the bolts 6 and nuts 7. An insulating strip C is fastenedl across the curved portionl 01E-the built-up permanent magnet by the same bolts 6 being passed through its end portions. An electromagnet is mounted z5 between the poles 2 and 3, and 4 and 5 of the permanent magnet. The said electromagnet consists of a coil 'D with the ends thereof fastened to the contact posts 8 and 9 which are secured on the insulating strip C. The l0 said coil D is wound on a spool or armature E having a flat pivoted core 10 which vis parallel with the median plane of said permanent magnet and movable on its pivot by the electrical impulses received b said coil.

L5 One edge of said core is extende as shown at 10, and to which is secured the diaphragm 11 by the connecting pin 12. A cap meinber carries the horn, which is not` shown, and also a cylindrical casing or cuptG which is secured to said cap member F, 'and-.writhin which eu member the magnets are Xfastened. e amature 10 is pivoted and poised in a neutral normal position between the north and south poles of the permanent magnet., which magnet, as before explained, may be made of one or a plurality of said steel forms, shown in Figure 4. The electromagnetic impulses force the armature from neutral position, and this action allows the permanent magnet to get a closer magnetic connection with lthe armature and quicker action in its movements and impulses to the diaphragm, as well as to intensify the impulses. Thereis a local magnetic fiux existing between the bifurcated ends 2 and 3, and 4 and 5. This magnetic iux has also a direct harmonious action onthe armature 10, causing it to smooth out the sounds. When armature 10 is energized by incoming impulses it is disturbed from its neutral position and there is' some noise and foreign distortion takes placein getting back to its required position, this flux has a distinetbearf ing on eliminating this condition.

Having thus described'my invention and its operation I desire to secure by Letters Patent and elaimz- 1. A receiver comprising one or more flat steel magnets of the horseshoe type, having one end'portion bifureated and bent to' form two parallel spaced apart poles; and other similarly shaped magnets secured thereto with the bifurcated portions opposed in direction; an electromagnet mounted between the prongs of said bifurcated portions; a poised core mounted therein; a dia,- phragm substantially parallel with the planes of the first mentioned magnets and operatively connected with the poised core of the electromagnet.

2. A receiver comprising a magnet of the horseshoe type made up of steel lamina; one leg of sai magnet bifurcated; an electromagnet mounted between the bifurcations of the magnet; said eleetromagnet having a poised core at right angles lto the plane of the -first-mentioned magnet; and a dia- ,phragmA mounted in the plane of thel firstmentioned magnet; with means connecting said poised core and said diaphragm.

'In testimony whereof I have 'axed my signature.

GEORGE F. BORKMAN.

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